I had a similar problem before. If the SW navboot file be modded / modified with NavTweak 2.6 this problem occur ( if Spalshscreen and Skyline replaced ).

If I understood it correctly the system stop navigation and reboot when receiving a TMC message.
You can deactivate TMC function and it should work stable or use Navtweak 2.7 to create a new SW disk.

I made a new disk with Navtweak 2.7 and have no problems